from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
from django.shortcuts import render, get_object_or_404

from django.core.mail import send_mail
from .models import Post
from .forms import EmailPostForm,CommentForm
from taggit.models import Tag
from django.db.models import Count
from django.contrib.postgres.search import SearchVector
from .forms import EmailPostForm, CommentForm, SearchForm
# Create your views here.
def post_list(request, tag_slug=None):
    posts = Post.published.all()
    tag = None
    if tag_slug:
        tag = get_object_or_404(Tag, slug=tag_slug)
        posts = posts.filter(tags=tag)
    paginator = Paginator(posts, 3)
    page = request.GET.get('page')
    try:
        posts = paginator.page(page)
    except PageNotAnInteger:
        posts = paginator.page(1)
    except EmptyPage:
        posts = paginator.page(paginator.num_pages)
    return render(request, 'blog/post/list.html' , 
                            {'posts': posts,
                            'page': page,
                            'tag': tag})
def post_detail(request, year, month, day, post):
    post = get_object_or_404(Post, slug=post, status='published',
                            publish__year=year,
                            publish__month=month,
                            publish__day=day)
    post_tags_ids = post.tags.values_list('id', flat=True)
    similar_posts = Post.published.filter(tags__in=post_tags_ids)\
                                    .exclude(id=post.id)

    similar_posts = similar_posts.annotate(same_tags=Count('tags'))\
                                .order_by('-same_tags','-publish')[:4]
    comments = post.comments.filter(active=True)
    new_comment = None
    if request.method == 'POST':
        comment_form = CommentForm(data=request.POST)
        if comment_form.is_valid():
            new_comment = comment_form.save(commit=False)
            new_comment.post = post
            new_comment.save()
    else:
        comment_form = CommentForm()
    return render(request, 
                    'blog/post/detail.html',    
                    {'post': post,
                    'comments': comments,
                    'new_comment': new_comment,
                    'comment_form': comment_form,
                    'similar_posts': similar_posts}) 
def post_share(request, post_id):
    return render(request, 'blog/post/share.html')
def post_share(request, post_id):
    post = get_object_or_404(Post, id=post_id, status='published')
    sent = False
    if request.method == 'POST':
        form = EmailPostForm(request.POST)
        if form.is_valid():

            cd = form.cleaned_data
            post_url = request.build_absolute_uri(post.get_absolute_url())
            subject = f"{cd['name']} recommends you read " \
                        f"{post.title}"
            message = f"Read {post.title} at {post_url}\n\n" \
                        f"{cd['name']}\'s comments: {cd['comments']}"
            send_mail(subject, message, '3404074206@qq.com', [cd['to']])
            sent = True
    else:
        form = EmailPostForm()
    return render(request, 'blog/post/share.html', {'post': post,
                                                'form': form,
                                                'sent': sent})
def post_search(request):
    form = SearchForm()
    query = None
    results = []
    if 'query' in request.GET:

        form = SearchForm(request.GET)
    if form.is_valid():
        query = form.cleaned_data['query']
        results = Post.published.annotate(
            search=SearchVector('title', 'body')
            ).filter(search=query)
    return render(request,
                    'blog/post/search.html', {
                    'form': form,
                    'query': query,
                    'results': results
            })